Transition strengths in the neutron-rich Ni73,74,75 isotopes-猫眼课题宝

DOI：

10.1103/physrevc.102.014323

发表时间：

2020-07

期刊：

Physical Review C

影响因子：

3.1

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

A. Gottardo;G. de Angelis;P. Doornenbal;L. Coraggio;A. Gargano;N. Itaco;K. Kaneko;P. Van Isacker;T. Furumoto;G. Benzoni;J. Lee;H. Liu;M. Matsushita;D. Mengoni;V. Modamio-Hoybjor;S. Momiyama;T. Motobayashi;D. Napoli;M. Niikura;E. Sahin;Y. Shiga;H. Sakurai;R. Taniuchi;S. Takeuchi;H. Wang;J. Valiente-Dobon;R. Avigo;H. Baba;N. Blasi;F. L. Bello Garrote;F. Browne;F. Crespi;S. Ceruti;R. Daido;M. Delattre;D. Fang;Z. Dombrádi;T. Isobe;I. Kuti;G. Lorusso;K. Matsui;B. Melon;T. Miyazaki;S. Nishimura;R. Orlandi;Z. Patel;S. Rice;L. Sinclair;P. Söderström;D. Sohler;T. Sumikama;J. Taprogge;Z. Vajta;H. Watanabe;O. Wieland;J. Wu;Z. Xu;M. Yalçınkaya;R. Yokoyama

在日本理化学研究所西那中心，用相对论库仑激发测量了富中子ni73,74,75核的跃迁概率。对于偶偶镍同位素，测定的B（E2;0+→2+）值与先前的中间能库仑激发实验的结果在误差范围内是一致的，尽管大一些。对于奇数镍同位素，首次测定了B（E2）值。在中间νg9/2壳层核Ni73中观察到三个候选峰，并暂定为（5/2+），（13/2+）和（11/2+）激发。在Ni75中观察到两个候选峰，暂定为（13/2+）和（11/2+）水平。测量到的B（E2）值与Ni70中报告的大B（E2）值一致，与Ni72中测量到的小强度值不同。激发能与大尺度壳模型计算结果吻合较好，但B（E2）值大于预测值。这可能表明，当接近Ni78时，质子激发在Z=28壳层闭合处的贡献增加。

Reduced transition probabilities have been measured for the neutron-rich Ni73,74,75 nuclei with relativistic Coulomb excitation performed at the RIKEN Nishina Center. For the even-even Ni isotope the determined B(E2;0+→2+) value is compatible within errors with the result of a previous intermediate energy Coulomb excitation experiment, although being somewhat larger. For the odd Ni isotopes B(E2) values have been determined for the first time. In the middle νg9/2 shell nucleus Ni73 three peak candidates have been observed and tentatively assigned to the (5/2+), (13/2+), and (11/2+) excitations. Two peak candidates have been observed in Ni75 and tentatively assigned to the (13/2+) and (11/2+) levels. The measured B(E2) values are in line with the large B(E2) reported in Ni70 and at variance with the small strength measured in Ni72. Excitation energies compare well with the result of large-scale shell-model calculations, while B(E2) values are larger than predicted. This could indicate an increasing contribution of proton excitations across the Z=28 shell closure when approaching Ni78.

Transition strengths in the neutron-rich Ni73,74,75 isotopes

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